Re: [PATCH -mmotm 3/8] memcg: add interface to move charge at task migration

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Mon, 21 Dec 2009 14:33:46 +0900
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> wrote:

> In current memcg, charges associated with a task aren't moved to the new cgroup
> at task migration. Some users feel this behavior to be strange.
> These patches are for this feature, that is, for charging to the new cgroup
> and, of course, uncharging from the old cgroup at task migration.
> 
> This patch adds "memory.move_charge_at_immigrate" file, which is a flag file to
> determine whether charges should be moved to the new cgroup at task migration or
> not and what type of charges should be moved. This patch also adds read and
> write handlers of the file.
> 
> This patch also adds no-op handlers for this feature. These handlers will be
> implemented in later patches. And you cannot write any values other than 0
> to move_charge_at_immigrate yet.
> 
> Changelog: 2009/12/14
> - Add TODO section to meory.txt.
> Changelog: 2009/12/04
> - change the term "recharge" to "move_charge".
> - update document.
> Changelog: 2009/11/19
> - consolidate changes in Documentation/cgroup/memory.txt, which were made in
>   other patches separately.
> - handle recharge_at_immigrate as bitmask(as I did in first version).
> - use mm->owner instead of thread_group_leader().
> Changelog: 2009/09/24
> - change the term "migration" to "recharge".
> - handle the flag as bool not bitmask to make codes simple.
> 
> Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

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